SpringCloud（第 043 篇）链接Mysql数据库简单的集成Mybatis框架访问数据库
–
一、大致介绍
1、访问数据库，自然少不了一些持久化框架，而我本身也是Mybatis框架的支持者；
2、Mybatis是那种专注于sql的框架，对象映射以及输入输出都是由框架自动完成；
3、因此本章节就简单小试牛刀尝试下如何使用Mybatis持久化框架进行对数据的操作；二、实现步骤
2.1 添加 maven 引用包
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>springms-provider-user-mysql-mybatis</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<parent>
<groupId>com.springms.cloud</groupId>
<artifactId>springms-spring-cloud</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<dependencies>
<!-- 访问数据库模块 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!-- web模块 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- MYSQL -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- Mybatis依赖 -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.1</version>
</dependency>
</dependencies>
</project>2.2 添加应用配置文件（springms-provider-user-mysql-mybatissrcmainresourcesapplication.yml）
server:
port: 8325
spring:
application:
name: springms-provider-user-mysql-mybatis #全部小写
#####################################################################################################
# mysql 属性配置
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://ip:3306/hmilyylimh
username: username
password: password
# jpa:
# hibernate:
# #ddl-auto: create #ddl-auto:设为create表示每次都重新建表
# ddl-auto: update #ddl-auto:设为update表示每次都不会重新建表
# show-sql: true
#####################################################################################################
#####################################################################################################
# 打印日志
logging:
level:
root: INFO
org.hibernate: INFO
org.hibernate.type.descriptor.sql.BasicBinder: TRACE
org.hibernate.type.descriptor.sql.BasicExtractor: TRACE
com.springms: DEBUG
#####################################################################################################
2.3 添加实体用户类User（springms-provider-user-mysql-mybatis/src/main/java/com/springms/cloud/entity/User.java）
package com.springms.cloud.entity;
import javax.persistence.*;
/**
*
* Mybatis 需要加上这些注解才可以使用，不然启动都会报错；
*
*/
@Entity
public class User {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@Column
private String username;
@Column
private String name;
@Column
private Integer age;
@Column
private String balance;
public Long getId() {
return this.id;
}
public void setId(Long id) {
this.id = id;
}
public String getUsername() {
return this.username;
}
public void setUsername(String username) {
this.username = username;
}
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return this.age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getBalance() {
return this.balance;
}
public void setBalance(String balance) {
this.balance = balance;
}
}
2.4 添加用户mapper接口（springms-provider-user-mysql-mybatis/src/main/java/com/springms/cloud/mapper/IUserMapper.java）
package com.springms.cloud.mapper;
import com.springms.cloud.entity.User;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import java.util.List;
/**
* 用户 mybatis 映射文件。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 2017-10-19
*
*/
public interface IUserMapper {
@Select("select * from user where id = #{id}")
User findUserById(Long id);
@Select("select * from user")
List<User> findAllUsers();
@Insert("INSERT INTO user(username, name, age, balance) VALUES(#{username}, #{name}, #{age}, #{balance})")
int insertUser(User user);
}2.5 添加用户mapper接口实现类（springms-provider-user-mysql-mybatis/src/main/java/com/springms/cloud/mapper/user/UserMapper.java）
package com.springms.cloud.mapper.user;
/**
*
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 2017-10-19
*
*/
public class UserMapper {
}
2.6 添加用户Service接口类（springms-provider-user-mysql-mybatis/src/main/java/com/springms/cloud/service/IUserService.java）
package com.springms.cloud.service;
import com.springms.cloud.entity.User;
import java.util.List;
/**
* 简单用户链接Mysql数据库微服务（通过@Service注解标注该类为持久化操作对象）。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 2017-10-19
*
*/
public interface IUserService {
User findUserById(Long id);
List<User> findAllUsers();
int insertUser(User user);
}
2.7 添加用户Service接口实现类（springms-provider-user-mysql-mybatis/src/main/java/com/springms/cloud/service/impl/UserServiceImpl.java）
package com.springms.cloud.service.impl;
import com.springms.cloud.entity.User;
import com.springms.cloud.mapper.IUserMapper;
import com.springms.cloud.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
/**
* 简单用户链接Mysql数据库微服务（通过@Service注解标注该类为持久化操作对象）。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 2017-10-19
*
*/
@Service
public class UserServiceImpl implements IUserService {
@Autowired
IUserMapper iUserMapper;
@Override
public User findUserById(Long id) {
return iUserMapper.findUserById(id);
}
@Override
public List<User> findAllUsers() {
return iUserMapper.findAllUsers();
}
@Override
public int insertUser(User user) {
return iUserMapper.insertUser(user);
}
}2.8 添加用户Web访问层Controller（springms-provider-user-mysql-mybatis/src/main/java/com/springms/cloud/controller/ProviderUserMysqlMybatisController.java）
package com.springms.cloud.controller;
import com.springms.cloud.entity.User;
import com.springms.cloud.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
/**
* 用户微服务Controller。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 2017-10-19
*
*/
@RestController
public class ProviderUserMysqlMybatisController {
@Autowired
private IUserService iUserService;
@GetMapping("/simple/{id}")
public User findUserById(@PathVariable Long id) {
return this.iUserService.findUserById(id);
}
@GetMapping("/simple/list")
public List<User> findUserList() {
return this.iUserService.findAllUsers();
}
/**
* 添加一个student,使用postMapping接收post请求
*
* http://localhost:8310/simple/addUser?username=user11&age=11&balance=11
*
* @return
*/
@PostMapping("/simple/addUser")
public User addUser(@RequestParam(value = "username", required=false) String username, @RequestParam(value = "age", required=false) Integer age, @RequestParam(value = "balance", required=false) String balance){
User user=new User();
user.setUsername(username);
user.setName(username);
user.setAge(age);
user.setBalance(balance);
int result = iUserService.insertUser(user);
if(result > 0){
return user;
}
user.setId(0L);
user.setName(null);
user.setUsername(null);
user.setBalance(null);
return user;
}
}
2.9 添加微服务启动类（springms-provider-user-mysql-mybatis/src/main/java/com/springms/cloud/MsProviderUserMysqlMybatisApplication.java）
package com.springms.cloud;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* 链接Mysql数据库简单的集成Mybatis框架访问数据库。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 2017-10-19
*
*/
@SpringBootApplication
@MapperScan("com.springms.cloud.mapper.**")
public class MsProviderUserMysqlMybatisApplication {
public static void main(String[] args) {
SpringApplication.run(MsProviderUserMysqlMybatisApplication.class, args);
System.out.println("【【【【【【 链接MysqlMybatis数据库微服务 】】】】】】已启动.");
}
}
三、测试
/****************************************************************************************
注意：Mybatis 需要加上 entity 等注解才可以使用，不然启动都会报错；
@MapperScan("com.springms.cloud.mapper.**") 或者在每个 Mapper 接口文件上添加 @Mapper 也可以；
一、简单用户链接Mysql数据库微服务（通过 mybatis 链接 mysql 编写数据访问）：
1、启动 springms-provider-user-mysql-mybatis 模块服务，启动1个端口；
2、在浏览器输入地址 http://localhost:8325/simple/10 可以看到用户ID=10的信息成功的被打印出来；
3、使用 IDEA 自带工具 Test Restful WebService 发送 HTTP POST 请求,并添加 username、age、balance三个参数，然后执行请求，并去 mysql 数据库查看数据是否存在，正常情况下 mysql 数据库刚刚插入的数据成功了:
4、使用 REST Client 执行 "/simple/list" 接口，也正常将 mysql 数据库中所有的用户信息打印出来了；
****************************************************************************************/
四、下载地址
https://gitee.com/ylimhhmily/SpringCloudTutorial.git
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